Inductance cancelled condenser implemented apparatus

Abstract

An apparatus comprises a condenser such as a condenser for reducing power source noise to be implemented on a board, a conductor for supplying a current passing through the condenser, and a current path comprising conductors and components which are installed in the neighborhood of at least one of the condenser and conductor and the effective inductance component of the condenser is reduced by passing a current through the current path in the phase opposite to that of a current passing through the condenser and conductor.

The invention claimed is: 
     
       1. An apparatus implementing a condenser comprising: a condenser implemented in said apparatus as one component part of said apparatus;   a conductor for supplying a current passing through said condenser; and   another component part of said apparatus implemented adjacent to said condenser for passing a current in a phase opposite to that of a current passing through said condenser and conductor.   
     
     
       2. An apparatus according to claim 1, wherein the apparatus is a board. 
     
     
       3. An apparatus according to claim 1, further comprising means for passing a current through said another component part of said apparatus in a phase opposite to that of a current passing through said condenser and conductor. 
     
     
       4. An apparatus according to claim 3, wherein the apparatus is a board implementing a condenser for reducing power source noise. 
     
     
       5. An apparatus according to claim 4, wherein said another component part includes at least one other condenser, the condenser for reducing power source noise and the at least one other condenser having a fixed-direction polarity, respectively, and connected to each other with each polarity reversed. 
     
     
       6. An apparatus according to claim 5, wherein the condenser and the at least one other condenser are connected in parallel with each other so as to be reversely polarized, respectively. 
     
     
       7. A board implementing a condenser for reducing power source noise comprising: a condenser for reducing power source noise implemented on said board as one component part of said board;   a conductor for supplying a current passing through said condenser; and   another component part on said board implemented adjacent to said condenser for passing a current in a phase opposite to that of a current passing through said condenser and conductor.   
     
     
       8. A board according to claim 7, wherein said another component part on said board for passing a current in the opposite phase is another conductor which is installed in parallel with said condenser and connected to the ground or power source at both ends. 
     
     
       9. A board according to claim 8, wherein said another conductor is connected to said ground or power source at a distance almost equal to the distance between two through-holes to which said condenser for reducing power source noise is connected. 
     
     
       10. A board according to claim 7, wherein said another component part on said board is one of traces of said condenser for reducing power source noise laid along said condenser for reducing power source noise. 
     
     
       11. A board according to claim 7, wherein said condenser for reducing power source noise is implemented via pads installed on said board and said another component part on said board is traces of a power supply conductor and a ground conductor which are led from said pads so that they are closest to each other. 
     
     
       12. A board according to claim 7, wherein said another component part on said board is a reversely polarized condenser which is installed in parallel with said condenser for reducing power source noise. 
     
     
       13. A board according to claim 7, wherein said another component part on said board for passing a current in the opposite phase comprises condensers for reducing power source noise constituting a composite condenser which are connected in parallel with each other so as to be reversely polarized respectively. 
     
     
       14. A board according to claim 7, further comprising means for passing a current through said another component part on said board in a phase opposite to that of a current passing through said condenser and conductor.